It is important for solving the problem of vibration and wave to determine correctly initial phrase and phrase at any moment.
正确确定初相和任意时刻的相位，对于解决振动和波动问题至关重要。
It is important for solving the problem of vibration and wave to determine correctly initial phrase and phrase at any moment.
正确确定初相和任意时刻的相位，对于解决振动和波动问题至关重要。
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